drivers/gpu/drm/radeon/radeon_ring.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Jerome Glisse.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Dave Airlie
  25  *          Alex Deucher
  26  *          Jerome Glisse
  27  */
  28 #include <linux/seq_file.h>
  29 #include <linux/slab.h>
  30 #include "drmP.h"
  31 #include "radeon_drm.h"
  32 #include "radeon_reg.h"
  33 #include "radeon.h"
  34 #include "atom.h"
  35
  36 int radeon_debugfs_ib_init(struct radeon_device *rdev);
  37
  38 void radeon_ib_bogus_cleanup(struct radeon_device *rdev)
  39 {
  40         struct radeon_ib *ib, *n;
  41
  42         list_for_each_entry_safe(ib, n, &rdev->ib_pool.bogus_ib, list) {
  43                 list_del(&ib->list);
  44                 vfree(ib->ptr);
  45                 kfree(ib);
  46         }
  47 }
  48
  49 void radeon_ib_bogus_add(struct radeon_device *rdev, struct radeon_ib *ib)
  50 {
  51         struct radeon_ib *bib;
  52
  53         bib = kmalloc(sizeof(*bib), GFP_KERNEL);
  54         if (bib == NULL)
  55                 return;
  56         bib->ptr = vmalloc(ib->length_dw * 4);
  57         if (bib->ptr == NULL) {
  58                 kfree(bib);
  59                 return;
  60         }
  61         memcpy(bib->ptr, ib->ptr, ib->length_dw * 4);
  62         bib->length_dw = ib->length_dw;
  63         mutex_lock(&rdev->ib_pool.mutex);
  64         list_add_tail(&bib->list, &rdev->ib_pool.bogus_ib);
  65         mutex_unlock(&rdev->ib_pool.mutex);
  66 }
  67
  68 /*
  69  * IB.
  70  */
  71 int radeon_ib_get(struct radeon_device *rdev, struct radeon_ib **ib)
  72 {
  73         struct radeon_fence *fence;
  74         struct radeon_ib *nib;
  75         int r = 0, i, c;
  76
  77         *ib = NULL;
  78         r = radeon_fence_create(rdev, &fence);
  79         if (r) {
  80                 dev_err(rdev->dev, "failed to create fence for new IB\n");
  81                 return r;
  82         }
  83         mutex_lock(&rdev->ib_pool.mutex);
  84         for (i = rdev->ib_pool.head_id, c = 0, nib = NULL; c < RADEON_IB_POOL_SIZE; c++, i++) {
  85                 i &= (RADEON_IB_POOL_SIZE - 1);
  86                 if (rdev->ib_pool.ibs[i].free) {
  87                         nib = &rdev->ib_pool.ibs[i];
  88                         break;
  89                 }
  90         }
  91         if (nib == NULL) {
  92                 /* This should never happen, it means we allocated all
  93                  * IB and haven't scheduled one yet, return EBUSY to
  94                  * userspace hoping that on ioctl recall we get better
  95                  * luck
  96                  */
  97                 dev_err(rdev->dev, "no free indirect buffer !\n");
  98                 mutex_unlock(&rdev->ib_pool.mutex);
  99                 radeon_fence_unref(&fence);
 100                 return -EBUSY;
 101         }
 102         rdev->ib_pool.head_id = (nib->idx + 1) & (RADEON_IB_POOL_SIZE - 1);
 103         nib->free = false;
 104         if (nib->fence) {
 105                 mutex_unlock(&rdev->ib_pool.mutex);
 106                 r = radeon_fence_wait(nib->fence, false);
 107                 if (r) {
 108                         dev_err(rdev->dev, "error waiting fence of IB(%u:0x%016lX:%u)\n",
 109                                 nib->idx, (unsigned long)nib->gpu_addr, nib->length_dw);
 110                         mutex_lock(&rdev->ib_pool.mutex);
 111                         nib->free = true;
 112                         mutex_unlock(&rdev->ib_pool.mutex);
 113                         radeon_fence_unref(&fence);
 114                         return r;
 115                 }
 116                 mutex_lock(&rdev->ib_pool.mutex);
 117         }
 118         radeon_fence_unref(&nib->fence);
 119         nib->fence = fence;
 120         nib->length_dw = 0;
 121         mutex_unlock(&rdev->ib_pool.mutex);
 122         *ib = nib;
 123         return 0;
 124 }
 125
 126 void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib **ib)
 127 {
 128         struct radeon_ib *tmp = *ib;
 129
 130         *ib = NULL;
 131         if (tmp == NULL) {
 132                 return;
 133         }
 134         if (!tmp->fence->emited)
 135                 radeon_fence_unref(&tmp->fence);
 136         mutex_lock(&rdev->ib_pool.mutex);
 137         tmp->free = true;
 138         mutex_unlock(&rdev->ib_pool.mutex);
 139 }
 140
 141 int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib)
 142 {
 143         int r = 0;
 144
 145         if (!ib->length_dw || !rdev->cp.ready) {
 146                 /* TODO: Nothings in the ib we should report. */
 147                 DRM_ERROR("radeon: couldn't schedule IB(%u).\n", ib->idx);
 148                 return -EINVAL;
 149         }
 150
 151         /* 64 dwords should be enough for fence too */
 152         r = radeon_ring_lock(rdev, 64);
 153         if (r) {
 154                 DRM_ERROR("radeon: scheduling IB failled (%d).\n", r);
 155                 return r;
 156         }
 157         radeon_ring_ib_execute(rdev, ib);
 158         radeon_fence_emit(rdev, ib->fence);
 159         mutex_lock(&rdev->ib_pool.mutex);
 160         /* once scheduled IB is considered free and protected by the fence */
 161         ib->free = true;
 162         mutex_unlock(&rdev->ib_pool.mutex);
 163         radeon_ring_unlock_commit(rdev);
 164         return 0;
 165 }
 166
 167 int radeon_ib_pool_init(struct radeon_device *rdev)
 168 {
 169         void *ptr;
 170         uint64_t gpu_addr;
 171         int i;
 172         int r = 0;
 173
 174         if (rdev->ib_pool.robj)
 175                 return 0;
 176         INIT_LIST_HEAD(&rdev->ib_pool.bogus_ib);
 177         /* Allocate 1M object buffer */
 178         r = radeon_bo_create(rdev, NULL,  RADEON_IB_POOL_SIZE*64*1024,
 179                                 true, RADEON_GEM_DOMAIN_GTT,
 180                                 &rdev->ib_pool.robj);
 181         if (r) {
 182                 DRM_ERROR("radeon: failed to ib pool (%d).\n", r);
 183                 return r;
 184         }
 185         r = radeon_bo_reserve(rdev->ib_pool.robj, false);
 186         if (unlikely(r != 0))
 187                 return r;
 188         r = radeon_bo_pin(rdev->ib_pool.robj, RADEON_GEM_DOMAIN_GTT, &gpu_addr);
 189         if (r) {
 190                 radeon_bo_unreserve(rdev->ib_pool.robj);
 191                 DRM_ERROR("radeon: failed to pin ib pool (%d).\n", r);
 192                 return r;
 193         }
 194         r = radeon_bo_kmap(rdev->ib_pool.robj, &ptr);
 195         radeon_bo_unreserve(rdev->ib_pool.robj);
 196         if (r) {
 197                 DRM_ERROR("radeon: failed to map ib poll (%d).\n", r);
 198                 return r;
 199         }
 200         for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
 201                 unsigned offset;
 202
 203                 offset = i * 64 * 1024;
 204                 rdev->ib_pool.ibs[i].gpu_addr = gpu_addr + offset;
 205                 rdev->ib_pool.ibs[i].ptr = ptr + offset;
 206                 rdev->ib_pool.ibs[i].idx = i;
 207                 rdev->ib_pool.ibs[i].length_dw = 0;
 208                 rdev->ib_pool.ibs[i].free = true;
 209         }
 210         rdev->ib_pool.head_id = 0;
 211         rdev->ib_pool.ready = true;
 212         DRM_INFO("radeon: ib pool ready.\n");
 213         if (radeon_debugfs_ib_init(rdev)) {
 214                 DRM_ERROR("Failed to register debugfs file for IB !\n");
 215         }
 216         return r;
 217 }
 218
 219 void radeon_ib_pool_fini(struct radeon_device *rdev)
 220 {
 221         int r;
 222
 223         if (!rdev->ib_pool.ready) {
 224                 return;
 225         }
 226         mutex_lock(&rdev->ib_pool.mutex);
 227         radeon_ib_bogus_cleanup(rdev);
 228
 229         if (rdev->ib_pool.robj) {
 230                 r = radeon_bo_reserve(rdev->ib_pool.robj, false);
 231                 if (likely(r == 0)) {
 232                         radeon_bo_kunmap(rdev->ib_pool.robj);
 233                         radeon_bo_unpin(rdev->ib_pool.robj);
 234                         radeon_bo_unreserve(rdev->ib_pool.robj);
 235                 }
 236                 radeon_bo_unref(&rdev->ib_pool.robj);
 237                 rdev->ib_pool.robj = NULL;
 238         }
 239         mutex_unlock(&rdev->ib_pool.mutex);
 240 }
 241
 242
 243 /*
 244  * Ring.
 245  */
 246 void radeon_ring_free_size(struct radeon_device *rdev)
 247 {
 248         if (rdev->family >= CHIP_R600)
 249                 rdev->cp.rptr = RREG32(R600_CP_RB_RPTR);
 250         else
 251                 rdev->cp.rptr = RREG32(RADEON_CP_RB_RPTR);
 252         /* This works because ring_size is a power of 2 */
 253         rdev->cp.ring_free_dw = (rdev->cp.rptr + (rdev->cp.ring_size / 4));
 254         rdev->cp.ring_free_dw -= rdev->cp.wptr;
 255         rdev->cp.ring_free_dw &= rdev->cp.ptr_mask;
 256         if (!rdev->cp.ring_free_dw) {
 257                 rdev->cp.ring_free_dw = rdev->cp.ring_size / 4;
 258         }
 259 }
 260
 261 int radeon_ring_lock(struct radeon_device *rdev, unsigned ndw)
 262 {
 263         int r;
 264
 265         /* Align requested size with padding so unlock_commit can
 266          * pad safely */
 267         ndw = (ndw + rdev->cp.align_mask) & ~rdev->cp.align_mask;
 268         mutex_lock(&rdev->cp.mutex);
 269         while (ndw > (rdev->cp.ring_free_dw - 1)) {
 270                 radeon_ring_free_size(rdev);
 271                 if (ndw < rdev->cp.ring_free_dw) {
 272                         break;
 273                 }
 274                 r = radeon_fence_wait_next(rdev);
 275                 if (r) {
 276                         mutex_unlock(&rdev->cp.mutex);
 277                         return r;
 278                 }
 279         }
 280         rdev->cp.count_dw = ndw;
 281         rdev->cp.wptr_old = rdev->cp.wptr;
 282         return 0;
 283 }
 284
 285 void radeon_ring_unlock_commit(struct radeon_device *rdev)
 286 {
 287         unsigned count_dw_pad;
 288         unsigned i;
 289
 290         /* We pad to match fetch size */
 291         count_dw_pad = (rdev->cp.align_mask + 1) -
 292                        (rdev->cp.wptr & rdev->cp.align_mask);
 293         for (i = 0; i < count_dw_pad; i++) {
 294                 radeon_ring_write(rdev, 2 << 30);
 295         }
 296         DRM_MEMORYBARRIER();
 297         radeon_cp_commit(rdev);
 298         mutex_unlock(&rdev->cp.mutex);
 299 }
 300
 301 void radeon_ring_unlock_undo(struct radeon_device *rdev)
 302 {
 303         rdev->cp.wptr = rdev->cp.wptr_old;
 304         mutex_unlock(&rdev->cp.mutex);
 305 }
 306
 307 int radeon_ring_init(struct radeon_device *rdev, unsigned ring_size)
 308 {
 309         int r;
 310
 311         rdev->cp.ring_size = ring_size;
 312         /* Allocate ring buffer */
 313         if (rdev->cp.ring_obj == NULL) {
 314                 r = radeon_bo_create(rdev, NULL, rdev->cp.ring_size, true,
 315                                         RADEON_GEM_DOMAIN_GTT,
 316                                         &rdev->cp.ring_obj);
 317                 if (r) {
 318                         dev_err(rdev->dev, "(%d) ring create failed\n", r);
 319                         return r;
 320                 }
 321                 r = radeon_bo_reserve(rdev->cp.ring_obj, false);
 322                 if (unlikely(r != 0))
 323                         return r;
 324                 r = radeon_bo_pin(rdev->cp.ring_obj, RADEON_GEM_DOMAIN_GTT,
 325                                         &rdev->cp.gpu_addr);
 326                 if (r) {
 327                         radeon_bo_unreserve(rdev->cp.ring_obj);
 328                         dev_err(rdev->dev, "(%d) ring pin failed\n", r);
 329                         return r;
 330                 }
 331                 r = radeon_bo_kmap(rdev->cp.ring_obj,
 332                                        (void **)&rdev->cp.ring);
 333                 radeon_bo_unreserve(rdev->cp.ring_obj);
 334                 if (r) {
 335                         dev_err(rdev->dev, "(%d) ring map failed\n", r);
 336                         return r;
 337                 }
 338         }
 339         rdev->cp.ptr_mask = (rdev->cp.ring_size / 4) - 1;
 340         rdev->cp.ring_free_dw = rdev->cp.ring_size / 4;
 341         return 0;
 342 }
 343
 344 void radeon_ring_fini(struct radeon_device *rdev)
 345 {
 346         int r;
 347
 348         mutex_lock(&rdev->cp.mutex);
 349         if (rdev->cp.ring_obj) {
 350                 r = radeon_bo_reserve(rdev->cp.ring_obj, false);
 351                 if (likely(r == 0)) {
 352                         radeon_bo_kunmap(rdev->cp.ring_obj);
 353                         radeon_bo_unpin(rdev->cp.ring_obj);
 354                         radeon_bo_unreserve(rdev->cp.ring_obj);
 355                 }
 356                 radeon_bo_unref(&rdev->cp.ring_obj);
 357                 rdev->cp.ring = NULL;
 358                 rdev->cp.ring_obj = NULL;
 359         }
 360         mutex_unlock(&rdev->cp.mutex);
 361 }
 362
 363
 364 /*
 365  * Debugfs info
 366  */
 367 #if defined(CONFIG_DEBUG_FS)
 368 static int radeon_debugfs_ib_info(struct seq_file *m, void *data)
 369 {
 370         struct drm_info_node *node = (struct drm_info_node *) m->private;
 371         struct radeon_ib *ib = node->info_ent->data;
 372         unsigned i;
 373
 374         if (ib == NULL) {
 375                 return 0;
 376         }
 377         seq_printf(m, "IB %04u\n", ib->idx);
 378         seq_printf(m, "IB fence %p\n", ib->fence);
 379         seq_printf(m, "IB size %05u dwords\n", ib->length_dw);
 380         for (i = 0; i < ib->length_dw; i++) {
 381                 seq_printf(m, "[%05u]=0x%08X\n", i, ib->ptr[i]);
 382         }
 383         return 0;
 384 }
 385
 386 static int radeon_debugfs_ib_bogus_info(struct seq_file *m, void *data)
 387 {
 388         struct drm_info_node *node = (struct drm_info_node *) m->private;
 389         struct radeon_device *rdev = node->info_ent->data;
 390         struct radeon_ib *ib;
 391         unsigned i;
 392
 393         mutex_lock(&rdev->ib_pool.mutex);
 394         if (list_empty(&rdev->ib_pool.bogus_ib)) {
 395                 mutex_unlock(&rdev->ib_pool.mutex);
 396                 seq_printf(m, "no bogus IB recorded\n");
 397                 return 0;
 398         }
 399         ib = list_first_entry(&rdev->ib_pool.bogus_ib, struct radeon_ib, list);
 400         list_del_init(&ib->list);
 401         mutex_unlock(&rdev->ib_pool.mutex);
 402         seq_printf(m, "IB size %05u dwords\n", ib->length_dw);
 403         for (i = 0; i < ib->length_dw; i++) {
 404                 seq_printf(m, "[%05u]=0x%08X\n", i, ib->ptr[i]);
 405         }
 406         vfree(ib->ptr);
 407         kfree(ib);
 408         return 0;
 409 }
 410
 411 static struct drm_info_list radeon_debugfs_ib_list[RADEON_IB_POOL_SIZE];
 412 static char radeon_debugfs_ib_names[RADEON_IB_POOL_SIZE][32];
 413
 414 static struct drm_info_list radeon_debugfs_ib_bogus_info_list[] = {
 415         {"radeon_ib_bogus", radeon_debugfs_ib_bogus_info, 0, NULL},
 416 };
 417 #endif
 418
 419 int radeon_debugfs_ib_init(struct radeon_device *rdev)
 420 {
 421 #if defined(CONFIG_DEBUG_FS)
 422         unsigned i;
 423         int r;
 424
 425         radeon_debugfs_ib_bogus_info_list[0].data = rdev;
 426         r = radeon_debugfs_add_files(rdev, radeon_debugfs_ib_bogus_info_list, 1);
 427         if (r)
 428                 return r;
 429         for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
 430                 sprintf(radeon_debugfs_ib_names[i], "radeon_ib_%04u", i);
 431                 radeon_debugfs_ib_list[i].name = radeon_debugfs_ib_names[i];
 432                 radeon_debugfs_ib_list[i].show = &radeon_debugfs_ib_info;
 433                 radeon_debugfs_ib_list[i].driver_features = 0;
 434                 radeon_debugfs_ib_list[i].data = &rdev->ib_pool.ibs[i];
 435         }
 436         return radeon_debugfs_add_files(rdev, radeon_debugfs_ib_list,
 437                                         RADEON_IB_POOL_SIZE);
 438 #else
 439         return 0;
 440 #endif
 441 }